Improvement in dyeing with madder colors



UNITED STATES PATENT OFFICE.

ALEXANDER CAMPBELL DUNCAN'AND ARCHIBALB DUNCAN, OF MAN- CHESTER, ENGLAND.

IMPROVEMENT IN DYEING WITH MADDER COLORS.

Specification forming part of Letters Patent No. 128,027, dated J une 18, 1872.

To all whom it may concern:

Be it known that we, ALEXANDER CAMP- BELL DUNCAN and AROHIBALD DUNcAN, of the city of Manchester, in the county of Lancaster, in that part of the United Kingdom of Great Britain and Ireland called England, have invented or discovered certain Improvements in Dyeing: and We do hereby declare that the following is a full and exact description thereof-that is to say:

This invention has reference to the dyeing of goods or fabrics with the coloring-matter of madder, or with the so-called artificial a-lizarine; and consists: instead of dyeing the goods with the liquor at a lower temperature at the commencement, and gradually increasing its intensity, as now done, we pass the goods through the hot water, saturated with the coloring-matter of madder or artificial alizarine, heated and kept at as high a temperature as throughout, instead of as at present adopted,

as herein described.

Witness our hands this eighth day of March, one thousand eight hundred and seventy-two.

ALEXR. C; DUNCAN. Witnesses: ARCH. DUNCAN.

G. SEPTIMUS HUGHES, CHAS. W. COLLINS. 

